Enter the observed and expected counts for each genetic-cross category. The test asks: are the differences just chance, or is the genetic hypothesis wrong? χ² = Σ(O−E)²/E.
■ observed □ expected
| Category | Observed | Expected |
|---|
Try: load the dihybrid 9:3:3:1, click Fill expected from ratio, then nudge one observed count far from its expected. Watch χ² climb past the critical value 7.815 (df = 3) and the verdict flip to reject.